ID 111281
Title Alternative
フクロネズミ腎近位尿細管細胞におけるナトリウム依存性リン酸トランスポーターNaPi-IIcと細胞内vacuole形成の関連
NaPi-IIc induces vacuole formation in OK cells
Author
Shiozaki, Yuji University of Tokushima
Ohnishi, Saori University of Tokushima
Ohi, Akiko University of Tokushima
Ito, Mikiko University of Hyogo
Kido, Shinsuke Kinki University
Keywords
proximal tubule
SLC34A3
opossum kidney cells
proliferation
vacuole
Content Type
Thesis or Dissertation
Description
NaPi-IIc/SLC34A3 is a sodium-dependent inorganic phosphate (Pi) transporter in the renal proximal tubules and its mutations cause hereditary hypophosphatemic rickets with hypercalciuria (HHRH). In the present study, we created a specific antibody for opossum SLC34A3, NaPi-IIc (oNaPi-IIc), and analyzed its localization and regulation in opossum kidney cells (a tissue culture model of proximal tubular cells). Immunoreactive oNaPi-IIc protein levels increased during the proliferative phase and decreased during differentiation. Moreover, stimulating cell growth upregulated oNaPi-IIc protein levels, whereas suppressing cell proliferation downregulated oNaPi-IIc protein levels. Immunocytochemistry revealed that endogenous and exogenous oNaPi-IIc proteins localized at the protrusion of the plasma membrane, which is a phosphatidylinositol 4,5-bisphosphate (PIP2) rich-membrane, and at the intracellular vacuolar membrane. Exogenous NaPi-IIc also induced cellular vacuoles and localized in the plasma membrane. The ability to form vacuoles is specific to electroneutral NaPi-IIc, and not electrogenic NaPi-IIa or NaPi-IIb. In addition, mutations of NaPi-IIc (S138F and R468W) in HHRH did not cause cellular PIP2-rich vacuoles. In conclusion, our data anticipate that NaPi-IIc may regulate PIP2 production at the plasma membrane and cellular vesicle formation.
Journal Title
The Journal of Medical Investigation
ISSN
13496867
13431420
NCID
AA11166929
AA12022913
Publisher
Faculty of Medicine Tokushima University
Volume
62
Issue
3-4
Start Page
209
End Page
218
Sort Key
209
Published Date
2015-08
Remark
内容要旨・審査要旨・論文本文の公開:
内容要旨・審査要旨 : LID201508051001.pdf
論文本文 : LID201509301001.pdf
本論文は,著者Yuji Shiozakiの学位論文として提出され,学位審査・授与の対象となっている。
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
ETD
MEXT report number
甲第2867号
Diploma Number
甲栄第230号
Granted Date
2015-07-23
Degree Name
Doctor of Nutritional Science
Grantor
Tokushima University
departments
Medical Sciences